Crushed aggregate is produced in quarries using an impact crusher to process larger stones. It is divided into fine and coarse types, suitable for specific construction and landscaping uses. The creation process is expensive, but necessary for concrete construction.
Crushed aggregate, also known as rock aggregate, refers to a crushed stone product produced in quarries. In areas where natural deposits of sand and gravel are insufficient to handle local demand, larger stones are processed in an impact crusher to create crushed rock aggregate. The higher production costs involved in quarrying and processing the stones to create crushed aggregates mean that the cost of this material is often significantly higher than that of comparable natural products.
All aggregates are divided into two types: fine and coarse. Fine aggregate is broken into smaller pieces than coarse aggregate. When passed through a separator or aggregate washer, the coarse crushed aggregate will pass through a 3cm sieve, but will not pass through a #1 sieve. 7.62. The fine crushed aggregate will pass through a No. 1 sieve. 4 but will be stopped by a sieve n. 4 during the aggregate screening process.
The different sizes and types of aggregates are appropriate for specific uses in the construction and landscaping industries. For example, although larger, coarser crushed aggregates are cheaper, this type of aggregate can present problems when used in concrete forms for vertical structures. By comparison, fine aggregate is suitable for use in concrete, but would not be a recommended choice for creating a roadbed or driveway.
The stone and aggregate industry creates crushed aggregate using a lengthy process. The stone must be extracted in a quarry and then transported to the mill, which begins the process of crushing the larger stones into more manageable pieces. As the stones leave the rock crusher, they are sent to a rock conveyor for transport to the impact crusher, where they will be further crushed.
After being processed in the impact crusher, the aggregate is screened for sizing. This process could be handled in a shaker or during the washing process in an aggregate washer. If the aggregate is sufficiently crushed, it is transported to the storage area. If the stone is not crushed to the desired size and type, the process is repeated or the stone is transported to other equipment for further processing.
So much machinery, time and labor is involved in the creation of crushed aggregate that it can become a very expensive product. Despite the cost, aggregate products are the main component of concrete construction. In most cases, crushed aggregate is used locally to avoid further material transportation costs.
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